To surely inform an emergency system such as a monitoring center of an emergency state such as the theft of a vehicle, even when communication lines L1, L2 are cut.

Radio communication functions are provided in a navigation system 40 for detecting positional information or the like of the own vehicle, an automobile phone system 60 for transmitting an emergency signal to the monitoring center through a radiotelephone line, and a supervising controller 10 for control supervisingly the navigation system 40 and the phone system 60, and communication by a radio wave is allowed between the controller 10 and the navigation system 40/the phone system 60.